A promising candidate among the NISQ hardware is a quantum computer using a superconductor. In particular, transmon-based quantum computer is known as a best candidate for constructing realistic quantum computers[1]}, [2]}, [3]}, [4]}, [5]}.
In NISQ hardware including superconducting quantum computers, errors of the Z operator occur more frequently than those of other types. Because of this fact, there have been quantum error correcting codes dealing with the bias of the Z error[6]}, [7]}, [8]}, which are Tailored Surface code[9]}, [10]}, [11]} and XZZX code [12]}, [13]}. When the properties of bias and a symmetry of the syndrome are used, those codes provide a better threshold compared to the surface code, even though they have the identical form of assignment in qubits on the lattice structure.
